1982 LINEAR DIVISION PRODUCTS

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1982 LINEAR DIVISION PRODUCTS

FAIRCHILO

A Schlumberger Company

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Fairchild reserves the right to make changes in the circuitry or specifications in this book at any time without notice.

Manufactured under one of the following U.S. Patents: 2981877, 3015048, 3064167, 3108359, 3117260, other patents pending.

Fairchild cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied in a Fairchild product.

No other circuit patent licenses are implied.

Printed in U.S.A. 610000 100M January 1982

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Introduction

Product specifications in this data book cover the current standard linear product line. The data sheets included are organized in sections by type of product-Operational Amplifier, Comparator, Voltage Regulator, Interface, Data Acquisition, Telecommunication, and Special Function. In addition, a separate section covers hybrid voltage regulators.

Basic product specifications are listed on each data sheet, including maximum ratings, electrical characteristics, performance curves, and packaging information. For many products, typical applications and test circuits are also included. A separate section on packaging includes detailed information about the various packages available. The codes included on each data sheet indicate the specific package(s) offered for the product.

An industry cross reference 'keys Fairchild linear products to direct replacements and functional equivalents offered by other major linear product manufacturers. In addition, there is an alpha-numeric product listing including all basic part numbers. Electrical, temperature, and package variations as indicated by suffixes are not included in the alpha-numeric listing. These variations are indicated on the data sheet referenced under Order Information. An explanation of the part numbering method appears at the beginning of the packaging section.

Information about high reliability linear products and any other product information may be obtained from a local sales office or by contacting:

Fairchild Linear Products Marketing Department MS 4-370 313 Fairchild Drive

Mountain View, California 94042

Any inquiries involving the hybrid voltage regulators included in this data book should be directed to:

Fairchild Hybrid Products

Marketing Department MS 19-1425 369 Whisman Road

Mountain View, California 94042

The specifications included in this data book are as current and correct as could reasonably be determined at time of printing. Any errors noted by users, whether involving content or omission, can be directed to Linear Marketing at the above address; such information would be appreciated.

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FAIRCHILD

Section One Page

Alpha Numeric Index ... 1-3 Industry Cross Reference ... 1-5 Ordering Information ... 1-10

Section Two Voltage Regulators

Testing ... 2-3 Thermal Considerations ... 2-7

~A7800 Series ... 2-14

~A78MOO Series ... 2-28

~A78LOO Series ... 2-43

~A109, ~A209, ~A309 ... 2-51

~A7900 Series ... 2-57

~A 79MOO Series ... 2-66

~A78G, ~A79G ... 2-74

~A78MG, ~A79MG ... 2-84

~A723 ... 2-94

~A105, ~A205, ~A305, ~A305A, ~A376 ... 2-102

~A 117, ~A217, ~A317 ... 2-109

~A431 ... 2-115

~A78S40 ... 2-119

~A494 ... 2-126

Section Three

Hybrid Voltage Regulators

~A78H05A ... 3-3

~A78P05 ... 3-7

~A78H12A ... 3-11

~A78HGA ... 3-15

~A79HG ... 3-19 SH323, SH223, SH123 ... 3-23 SH1605 ... 3-27

'Section Four

Operational Amplifiers

Testing ... 4-3

~A709 ... 4-9

~A714 , ... , ... 4-17

~A715 ... 4-25

~A725 ... 4-33

~A739, ~A749 ... 4-44

~A741 ... 4-55

~A747 ... 4-64

~A748 ... 4-73

~A759 ... 4-83

~A771,ILA772, ~A774 ... .4-92

~A776 ... 4-99

I=AIRCHILD

Indices, Cross Reference and Order Information

, " , , ' " ,~ , >~, '

" '~ ^, ^e ' , ' "

" / , ' , '

Data Acquisition'

Tilecommunications '

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,HI ., ..

P~aJng

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1-2

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F=AIRCHIL.O Alpha Numeric Index

Device Description Page Device Description Page

II

""A8T26A Interface 6-78 ""A248 Operational Amplifier 4-156

""A8T28A Interface 6-78 ""A293 Comparator 5-49

""A78G Voltage Regulator 2-74 ""A293A Comparator 5-49

""A78HGA Hybrid Voltage Regulator 3-15 ""A298 Data Acquisition 7-21

""A78H05A Hybrid Voltage Regulator 3-3 ""A301A Operational Amplifier 4-123

""A78H12A Hybrid Voltage Regulator 3-11 ""A305 Voltage Regulator 2-102

""A78L05A Voltage Regulator 2-43 ""A305A Voltage Regulator 2-102

""A78L62A Voltage Regulator 2-43 ""A307 Operational Amplifier 4-131

""A78L82A Voltage Regulator 2-43 ""A308 Operational Amplifier 4-137

""A78L98A Voltage Regulator 2-43 ""A308A Operational Amplifier 4-137

""A78L12A Voltage Regulator 2-43 ""A309 Voltage Regulator 2-51

""A78L15A Voltage Regulator 2-43 ""A311 Comparator 5-33

""A78M05 Voltage Regulator 2-28 ""A317 Voltage Regulator 2-109

""A78M06 Voltage Regulator 2-28 ""A318 Operational Amplifier 4-145

""A78M12 Voltage Regulator 2-28 ""A339 Comparator 5-40

""A78M15 Voltage Regulator 2-28 ""A339A Comparator 5-40

""A78MG Voltage Regulator 2-84 ""A376 Voltage Regulator 2-102

""A78P05 Hybrid Voltage Regulator 3-7 ""A393 Comparator 5-49

""A78S40 Voltage Regulator 2-119 ""A393A Comparator 5-49

""A79G Voltage Regulator 2-74 ""A398 Data Acquisition 7-21

""A79HG Hybrid Voltage Regulator 3-19 ""A431A Voltage Regulator 2-115

""A79M05 Voltage Regulator 2-66 ""A438 Interface 6-118

""A79M08 Voltage Regulator 2-66 ""A494 Voltage Regulator 2-126

""A79M12 Voltage Regulator 2-66 ""A555 Special Function 9-3

""A79M15 Voltage Regulator 2-66 ""A556 Special Function 9-9

""A79MG Voltage Regulator 2-84 ""A565 Data Acquisition 7-26

""Al0l Operational Amplifier 4-121 ""A571 Data Acquisition 7-33

""Al01A Operational Amplifier 4-123 ""A709 Operational Amplifier 4-9

""Al05 Voltage Regulator 2-102 ""A709A Operational Amplifier 4-9

""A 107 Operational Amplifier 4-131 ""A709C Operational Amplifier 4-9

""A 108 Operational Amplifier 4-137 ""A710 Comparator 5-3

""Al08A Operational Amplifier 4-137 ""A711 Comparator 5-10

""A 109 Voltage Regulator 2-51 ""A714 Operational Amplifier 4-17

""A 111 Comparator 5-33 ""A715 Operational Amplifier 4-25

""Al17 Voltage Regulator 2-109 ""A723 Voltage Regulator 2-94

""A124 Operational Amplifier 4-151 ""A725 Operational Amplifier 4-33

""A139 Comparator 5-40 ""A725A Operational Amplifier 4-33

""A148 Operational Amplifier 4-156 ""A726 Special Function 9-15

""A 193 Comparator 5-49 ""A727 Special Function 9-18

""A 193A Comparator 5-49 ""A 733 Special Function 9-22

""A198 Data Acquisition 7-21 ""A734 Comparator 5-16

""A201A Operational Amplifier 4-123 ""A741 Operational Amplifier 4-55

""A208A Operational Amplifier 4-137 ""A749 Operational Amplifier 4-44

""A209 Voltage Regulator 2-51 ""A757 Special Function 9-29

""A217 Voltage Regulator 2-109 ""A759 Operational Amplifier 4-83

""A224 Operational Amplifier 4-151 ""A760 Comparator 5-26

""A239 Comparator 5-40 ""A771 Operational Amplifier 4-92

""A239A Comparator 5-40 ""A772 Operational Amplifier 4-92 1-3

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Alpha Numeric Index

Device Description Page Device Description Page

IlA774 Operational Amplifier 4-92 IlA75450B Interface 6-96

IlA776 Operational Amplifier 4-99 IlA75451A Interface 6-96

IlA798 Operational Amplifier 4-115 IlA75452A Interface 6-96

IlA0801 Data Acquisition 7-42 IlA75452B Interface 6-96

IlA0802 Data Acquisition 7-51 IlA75453A Interface 6-96

IlA1488 Interface 6-38 IlA75461 Interface 6-96

IlA1489 Interface 6-42 IlA75462 Interface 6-96

IlA1558 Operational Amplifier 4-161 IlA75471 Interface 6-96

IlA2240 Special Function 9-36 IlA75472 Interface 6-96

IlA2901 Comparator 5-40 IlA75491 Interface 6-114

IlA2902 Operational Amplifier 4-151 IlA75492 Interface 6-114

IlA2903 Comparator 5-49 SH123 Hybrid Voltage Regulator 3-23

IlA3086 Special Function 9-46 SH223 Hybrid Voltage Regulator 3-23

IlA3302 Comparator 5-40 SH323 Hybrid Voltage Regulator 3-23

IlA3303 Operational Amplifier 4-166 SH1605 Hybrid Voltage Regulator 3-27

IlA3403 Operational Amplifier 4-166

IlA3448 Interface 6-72

IlA3680 Telecommunication 8-3

IlA4136 Operational Amplifier 4-174

IlA7392 Special Function 9-51

IlA7805 Voltage Regulator 2-14

IlA9636A Interface 6-27

IlA9650 Data Acquisition 7-3

IlA75107B Interface 6-46

IlA75108B Interface 6-46

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FAIRCHILD Industry

Cross Reference Guide

Part Fairchild Part Fairchild Part Fairchild

Number Equivalent Number Equivalent Number Equivalent

AMD AMD (Cont.) INTERSIL (Cont.)

•

715DC J.lA715DC LM139D J.lA139DM J.lA723HM J.lA723HM

715HC J.lA715HC LM139AD J.lA139ADM J.lA723PC J.lA723PC

715DM J.lA715DM LM201H J.lA201HC J.lA733HC J.lA733HC

715HM J.lA715HM LM201AH J.lA201AHM J.lA733HM J.lA733HM

723DC J.lA723DC LM208H J.lA208HM J.lA741FM J.lA741FM

723DM J.lA723DM LM208AH J.lA208AHM J.lA741HC J.lA741HC

723HC J.lA723HC LM224D J.lA224DV J.lA741HM J.lA741HM

723HM J.lA723HM LM239D J.lA239DC J.lA741TC J.lA741TC

723PC J.lA723PC LM239AD J.lA239ADC J.lA748HC J.lA748HC

725HC J.lA725HC LM301AH J.lA301AHC J.lA748HM J.lA748HM

725HM J.lA725HM LM305H J.lA305HC J.lA748TC J.lA748TC

733DC J.lA733DC LM305AH J.lA305AHC

733DM J.lA733DM LM308H J.lA308HC MOTOROLA

733HC J.lA733HC LM308AH J.lA308AHC LM101AH J.lA101AHM

733HM J.lA733HM LM311H J.lA311HC LM105HM J.lA105HM

741FM J.lA741FM LM324D J.lA324DC LM108H J.lA108HM

741HC J.lA741HC LM324N J.lA324PC LM108AH J.lA1 08AHM

741HM J.lA741HM LM339D J.lA339DC LM109K J.lA109KM

741AFM J.lA741AFM LM339N J.lA339PC LM111H J.lA111HM

741AHM J.lA741AHM LM339AD J.lA339ADC LM111J-8 J.lA111RM

741EHC J.lA741EHC LM339AN J.lA339APC LM117K J.lA117KM

747DC J.lA747DC LM124J J.lA124DM

747DM J.lA747DM INTERSIL LM139J J.lA139DM

747HC J.lA747HC ICL 108LNTY J.lA108HM LM139AJ J.lA139ADM

747HM J.lA747HM ICL741CHSPA J.lA741TC LM201AH J.lA201AHM

747PC J.lA747PC ICL 7 41 MHSTY J.lA741HM LM208H J.lA208HM

747ADM J.lA747ADM LM101AH J.lA101AHM LM208AH J.lA208AHM

747AHM J.lA747AHM LM105H J.lA105HM LM209K J.lA209KM

747EDC J.lA747EDC LM108H J.lA108HM LM217K J.lA217UV

747EHC J.lA747EHC LM108AH J.lA108AHM LM224J J.lA224DV

748HC J.lA748HC LM111H J.lA111HM LM239AJ J.lA239ADC

748HM J.lA748HM LM124J J.lA124DM LM239J J.lA239DC

AM1408L6 J.lA0802CDC LM301AH J.lA301AHC LM293H *J.lA293RC

AM1408L7 J.lA0802BDC LM301AN J.lA301ATC LM293AH *J.lA293ARC

AM1408L8 J.lA0802ADC LM305H J.lA305HC LM301AH J.lA301AHC

AM1458H J.lA1458HC LM308H J.lA308HC LM301AN J.lA301ATC

AM1508L8 J.lA0802DM LM308N J.lA308TC LM305H J.lA305HC

AM1558H J.lA1558HM LM308AH J.lA308AHC LM308AH J.lA308AHC

DAC-08CQ J.lA0801CDC LM308AN J.lA308ATC LM308AN J.lA308ATC

DAC-08EQ J.lA0801EDC LM311H J.lA311HC LM308H J.lA308HC

DAC-08Q J.lA0801DM LM311N J.lA311TC LM308N J.lA308TC

LM101H J.lA101HM LM324J J.lA324DC LM309K J.lA309KC

LM101AH J.lA101AHM LM324N-14 J.lA324PC LM311H J.lA311HC

LM105H J.lA105HM NE555N J.lA555TC LM311J-8 J.lA311RC

LM108H J.lA108HM NE556N J.lA556PC LM311N J.lA311TC

LM108AH J.lA1 08AHM J.lA723DC J.lA723DC LM317K J.lA317KC

LM111H J.lA111HM J.lA723DM J.lA723DM LM317T J.lA317UC

LM124D J.lA124DM J.lA723HC J.lA723HC LM324J J.lA324DC

·Note

Not exact package replacement

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Industry Cross Reference Guide

MOTOROLA (Cont.) MOTOROLA (Cont.) MOTOROLA (Cont.)

LM339AJ ILA339ADC MC1733CG ILA733HC MC78L05ACP ILA78L05AWC

LM339J ILA339DC MC1733CL ILA733DC MC78L 12ACP ILA78L 12AWC

LM393AN ILA393ATC MC1741CG ILA741HC MC78L 15ACP ILA78L 15AWC

LM393N ILA393TC MC1741CP1 ILA741TC MC78M05CG ILA78M05HC

LM710CH ILA710HC MC1741CU ILA741RC MC78M05CT ILA78M05UC

LM711CH ILA711HC MC1741G ILA741HM MC78M06CG ILA78M06HC

LM723CH ILA723HC MC1747CG ILA747HC MC78M06CT ILA78M06UC

LM723CJ ILA723DC MC1747CL ILA747DC MC78M08CG ILA78M08HC

LM741CH ILA741HC MC1747CP2 ILA747PC MC78M08CT ILA78M08UC

LM741CN ILA741TC MC1747G ILA747HM MC78M12CG ILA78M12HC

LM2901N ILA2901PC MC1747L ILA747DM MC78M12CT ILA78M12UC

LM2902N ILA2902PV MC1748CG ILA748HC MC78M15CT ILA78M15UC

LM2903N ILA2903TC MC1748CP1 ILA748TC MC78M24CT ILA78M24UC

MC1408L6 ILA0802CDC MC1748G ILA748HM MC7905CK ILA7905KC

MC1408L7 ILA0802BDC MC1776CG ILA776HC MC7905CT ILA7905UC

MC1408L8 ILA0802ADC MC1776CP1 ILA776TC MC7908CK ILA7908KC

MC1408P6 ILA0802CPC MC1776G ILA776HM MC7908CT ILA7908UC

MC1408P7 ILA0802BPC MC3302L ILA3302DC MC7912CK ILA7912KC

MC1408P8 ILA0802APC MC3302P ILA3302PC MC7912CT ILA7912UC

MC1411P ILA9665PC MC3303P ILA3303PC MC7915CK ILA7915KC

MC1412P ILA9666PC MC3386P ILA3086PC MC7915CT ILA7915UC

MC1413P ILA9667PC MC3403L ILA3403DC MC8T26AP ILA8T26APC

MC1416P ILA9668PC MC3403P ILA3403PC MC8T26AL ILA8T26ADC

MC1455P1 ILA555TC MC3440AP ILA9640PC MC8T28AP ILA8T28PC

MC1458CG ILA1458CHC MC3443P ILA9640PC MC8T28AL ILA8T28DC

MC1458CP1 ILA1458CTC MC3448AL ILA3448ADC SN75451BP *ILA75451BTC

MC1458CU ILA1458CRC MC3448AP ILA3448APC SN75452BP ILA75452BTC

MC1458G ILA1458HC MC3456P ILA556PC SN75453BP ILA75453BTC

MC1458P1 ILA1458TC MC3458P1 ILA798TC ILA710HC ILA710HC

MC1458U ILA1458RC MC3488AP ILA9636AT ILA711HC ILA711HC

MC1488L ILA1488DC MC3558U *ILA798TC ILA723DC ILA723DC

MC1488P ILA1488PC MC55107L ILA55107ADM ILA723HC ILA723HC

MC1489L ILA1489DC MC75107L ILA75107ADC ILA723PC ILA723PC

MC1489P ILA1489PC MC75107P ILA75107APC ILA741HC ILA741HC

MC1489AL ILA1489ADC MC75450P ILA75450BPC ILA741TC ILA741TC

MC1489AP ILA1489APC MC75451U ILA75451ARC

MC1508L8 ILA0802DM MC75452U ILA75452ARC NATIONAL

MC1558G ILA1558HM MC75453U ILA75453ARC DS75107J ILA75107ADC

MC1558U ILA1558RM MC75461P ILA75461TC DS75107N ILA75107APC

MC1709CP1 ILA709TC MC75462P ILA75462TC DS75108N ILA75108BPC

MC1709CP2 ILA709PC MC75491P ILA75491PC DS75450N ILA75450BPC

MC1709G ILA709HM MC75492P ILA75492PC DS75451J-8 ILA75451 ARC

MC1710CG ILA710HC MC7805K ILA7805KM DS75451N ILA75451ATC

MC1710CL ILA710DC MC7805CK ILA7805KC DS75452J-8 ILA75452ARC

MC1710CP ILA710PC MC7805CT ILA7805UC DS75452N ILA75452ATC

MC1710G ILA710HM MC7806CK ILA7806KC DS75453J-8 ILA75453ARC

MC1710L ILA710DM MC7806CT ILA7806UC DS75453N ILA75453ATC

MC1711CG ILA711HC MC7812K ILA7812KM DS75461N ILA75461TC

MC1711CL ILA711DC MC7812CK ILA7812KC DS75462N ILA75462TC

MC1711CP ILA711PC MC7812CT ILA7812UC DS75491N ILA75491PC

MC1711G ILA711HM MC7815K ILA7815KM DS75492N ILA75492PC

MC1711L ILA711DM MC7815CK ILA7815KC DS8T26AJ ILA8T26ADM

MC1723CG ILA723HC MC7815CT ILA7815UC DS8T28J ILA8T28DM

MC1723CL ILA723DC MC7818K ILA7818KM LF351N ILA771TC

MC1723CP ILA723PC MC7818CK ILA7818KC LF353N ILA772TC

MC1723G ILA723HM MC7818CT ILA7818UC LF398H ILA398HC

MC1723L ILA723DM MC7824K ILA7824KM LM101AH ILA101AHM

MC1733G ILA733HM MC7824CK ILA7824KC LM105H ILA105HM

MC1733L ILA733DM MC7824CT ILA7824UC LM108H ILA108HM

-Note

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Industry Cross Reference Guide

NATIONAL (Cont.) NATIONAL (Cont.) NATIONAL (Cont.)

LM108H J.LA108AHM LM709AH J.LA709AHM LM78M12CP °J.LA78M12UC

LM109K J.LA109KM LM710H J.LA710HM LM78M15CP °J.LA78M15UC

LM111H J.LA111HM LM710CH J.LA710HC LM7905CK J.LA7905KC

LM124J J.LA124DM LM710CN J.LA710PC LM7905CT J.LA7905UC

LM139J J.LA139DM LM711H J.LA711HM LM7912CK J.LA7912KC

LM139AJ J.LA139ADM LM711CH J.LA711HC LM7912CT J.LA7912UC

LM140K-5.0 J.LA7805KM LM711CN J.LA711PC LM7915CK J.LA7915KC

LM140K-8.0 J.LA7808KM LM723H J.LA723HM LM7915CT J.LA7915UC

LM140K-12 J.LA7812KM LM723J J.LA723DM LM7905CH J.LA79M05AHC

LM140K-15 J.LA7815KM LM723CH J.LA723HC LM7912CH J.LA79M12AHC

LM140K-18 J.LA7818KM LM723CJ J.LA723DC LM7915CH J.LA79M15AHC

LM140K-24 J.LA7824KM LM723CN J.LA723PC

LM201AH J.LA201AHM LM725H J.LA725HM PMI

LM208H J.LA208HM LM725CH J.LA725HC CMP-03AJ J.LA111HM

LM208AH J.LA208AHM LM725CN J.LA725TC CMP-03AZ J.LA111RM

LM209K J.LA209KM LM733H J.LA733HM CMP-04BY J.LA139DM

LM224J J.LA224DV LM733CH J.LA733HC CMP-04FY J.LA239DC

LM239J J.LA239DC LM733CN J.LA733PC DAC-08Q J.LA0801DM

LM239AJ J.LA239ADC LM741H J.LA741HM DAC-08Q J.LA0802DM

LM301AH J.LA301AHC LM741AH J.LA741AHM DAC-08CP J.LA0801CPC

LM301AN J.LA301ATC LM741CH J.LA741HC DAC-08CP J.LA0802BPC

LM305H J.LA305HC LM741CJ J.LA741RC DAC-08CQ J.LA0801CDC

LM305AH J.LA305AHC LM741CN J.LA741TC DAC-08CQ J.LA0802BDC

LM308H J.LA308HC LM741EH J.LA741EHC DAC-08EP J.LA0801EPC

LM308N J.LA308TC LM741EN J.LA741 ETC DAC-08EP J.LA0802APC

LM308AH J.LA308AHC LM747H J.LA747HM DAC-08EQ J.LA0801EDC

LM308AN J.LA308ATC LM747J J.LA747DM DAC-08EQ J.LA0802ADC

LM309K J.LA309KC LM747AH J.LA747AHM DAC1408A-6P J.LA0802CPC

LM311H J.LA311HC LM747AJ J.LA747ADM DAC1408A-6Q J.LA0802CDC

LM311J-8 J.LA311RC LM747CH J.LA747HC DAC1408A-7P J.LA0802BPC

LM311N J.LA311TC LM747CJ J.LA747DC DAC1408A-7Q J.LA0802BDC

LM317K J.LA317KC LM747CN J.LA747PC DAC1408A-8P J.LA0802APC

LM317T J.LA317UC LM747EH J.LA747EHC DAC 1408A-8Q J.LA0802ADC

LM324J J.LA324DC LM747EJ J.LA747EDC DAC1508A-8Q J.LA0802DM

LM324N J.LA324PC LM748H J.LA748HM OP-07J J.LA714HM

LM339J J.LA339DC LM748CH J.LA748HC OP-07CJ J.LA714HC

LM339N J.LA339PC LM748CN J.LA748TC OP-07EJ J.LA714EHC

LM339AJ J.LA339ADC LM760CH J.LA760HC PM108J J.LA108HM

LM339AN J.LA339APC LM1458H J.LA1458HC PM108AJ J.LA108AHM

LM340K-5.0 J.LA7805KC LM1458J J.LA1458RC PM111J J.LA111HM

LM340T-5.0 J.LA7805UC LM1458N J.LA1458TC PM111Z J.LA111RM

LM340K-6.0 J.LA7806KC LM1558H J.LA1558HM PM139Y J.LA139DM

LM340K-8.0 J.LA7808KC LM1558J J.LA1558RM PM208J J.LA208HM

LM340K-12 J.LA7812KC LM2901N J.LA2901PC PM208AJ J.LA208AHM

LM340T-12 J.LA7812UC LM2901J J.LA2901DC PM308J J.LA308HC

LM340K-15 J.LA7815KC LM2903N J.LA2903TC PM308P J.LA308TC

LM340T-15 J.LA7815UC LM3086N J.LA3086PC PM308AJ J.LA308AHC

LM340K-18 J.LA7818KC LM3302J J.LA3302DC PM308AP J.LA308ATC

LM340K-24 J.LA7824KC LM3302N J.LA3302PC PM311J J.LA311HC

LM348J J.LA348DC LM7805CK J.LA7805KC PM311Z J.LA311RC

LM348N J.LA348PC LM7805CT J.LA7805UC PM339Y J.LA339DC

LM376N J.LA376TC LM7812CK J.LA7812KC PM339AY J.LA339ADC

LM393N J.LA393TC LM7812CT J.LA7812UC PM725J J.LA725HM

LM555CN J.LAb55TC LM7815CK J.LA7815KC PM725CJ J.LA725HC

LM556CN J.LA556PC LM7815CT J.LA7815UC PM725CP J.LA725TC

LM709H J.LA709HM LM78L05ACZ J.LA78L05AWC PM741J J.LA741HM

LM709CH J.LA709HC LM78L 12ACZ J.LA78L 12AWC PM741CJ J.LA741HC

LM709CN J.LA709PC LM78L 15ACZ J.LA78L 15AWC PM741CZ J.LA741RC

LM709CN-8 J.LA709TC LM78M05CP °J.LA78M05UC PM1458J J.LA1458HC

·Note

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Industry Cross Reference Guide

PMI (Cont.) SILICON SILICON

PM1458Z ILA1458RC GENERAL GENERAL (Cont.)

PM1558J ILA1558HM SG10H ILA 101HM SG733J ILA733DM

PM1558Z ILA1558RM SG101AT pAl01AHM SG733T ILA733HM

SIGNETICS SG105T ILA105HM SG733CJ ILA733DC

LM101AH ILA101AHM SG108T ILA108HM SG733CN ILA733PC

LMlllH ILA 1l1HM SG108AT ILA108AHM SG733CT ILA733HC

LM124F ILA124DM SG109K ILA109KM SG741F ILA741FM

LM139F ILA139DM SGllH ILA111HM SG741T ILA741HM

LM193FE pA193RM SG117K ILAl17KM SG741CM ILA741TC

LM201AN 'ILA201AHM SG124J ILA l24DM SG747J ILA747DM

LM224N /LA224PV SG139J ILA139DM SG747T ILA747HM

LM224F ILA224DV SG139AJ ILA 139ADM SG747CJ ILA747DC

LM301AN ILA301ATC SG20H ILA201HC SG747CN ILA747PC

LM324N ILA324PC SG201AT ILA201AHM SG747CT ILA747HC

LM324F ILA324DC SG208T ILA208HM SG748T ILA748HM

LM339N ILA339PC SG208AT pA208AHM SG748CM ILA748TC

LM339F ILA339DC SG209K ILA209KM SG748CT ILA748HC

LM2901F ILA2901DC SG2l7P ILA217UV SG1458M ILA1458TC

LM2901N ILA2901PC SG224J ILA224DV SG1458T ILA1458HC

LM2903FE ILA2903RC SG224N ILA224PV SG1458CM pA1458CTC

LM2903N ILA2903TC SG239J ILA239DC SG1458CT ILA1458CHC

MC1458FE ILA1458RC SG239N pA239PC SG1488J ILA1488DC

MC1458H ILA1458HC SG239AJ ILA239ADC SG1489J ILA1489DC

MC1458N ILA1458TC SG239AN ILA239APC SG1489AJ ILA l489ADC

MC1488N ILA1488PC SG301AM ILA301ATC SG1558T ILA1558HM

MC1488F ILA 1488DC SG301AT ILA301AHC SG2001J 'ILA9665PC

MC1489N ILA1489PC SG305T ILA305HC SG2002J ILA9666DC

MC1489F pA1489DC SG305AT ILA305AHC SG2003J ILA9667DC

MC1489AN ILA1489APC SG308M ILA308TC SG3086J ILA3086DC

MC1489AF ILA1489ADC SG308T ILA308HC SG3086N ILA3086PC

MC1558H ILA1558HM SG308AM ILA308ATC SG3302J ILA3302DC

MC1558FE ILA1558RM SG308AT ILA308AHC SG3302N ILA3302PC

MC3302N ILA3302PC SG309K ILA309KC SG7805K ILA7805KM

MC3302F ILA3302DC SG3l1M ILA31HC SG7805CK ILA7805KC

NE5501 ILA9665PC SG311T ILA311HC SG7805CP ILA7805UC

ULN2001N ILA9665PC SG317K ILA317KC SG7808K ILA7808KM

ULN2003F ILA9667DC SG317P ILA317UC SG7808CK ILA7808KC

ULN2003N ILA9667PC SG324J ILA324DC SG7808CP ILA7808UC

ULN2004F ILA9668DC SG324N ILA324PC SG7812K ILA7812KM

ULN2004N pA9668PC SG339J ILA339DC SG78l2CK ILA7812KC

ILA723F ILA723DM SG339N ILA339PC SG7812CP pA7812UC

ILA723H ILA723HM SG339AJ ILA339ADC SG7815K ILA7815KM

ILA723CF ILA723DC SG339AN ILA339APC SG7815CK ILA7815KC

ILA723CH pA723HC SG555M ILA555TC SG7815CP ILA7815UC

ILA723CN ILA723PC SG556N ILA556PC SG7818K ILA7818KM

ILA733F ILA733DM SG710J ILA710DM SG7818CK ILA7818KC

pA733H pA733HM SG710T pA710HM SG7818CP ILA7818UC

ILA733CF ILA733DC SG710CN ILA710PC SG7824K ILA7824KM

ILA733CH ILA733HC SG710CT ILA710HC SG7824CK pA7824KC

ILA733CN ILA733PC SG711J ILA711DM SG7824CP ILA7824UC

ILA741FE ILA741RM SG711T ILA711HM SG7905K ILA7905KM

ILA741CFE ILA741RC SG711CJ ILA711DC SG7905CK ILA7905KC

ILA741CN ILA741TC SG711CN ILA711PC SG7905CP ILA7905UC

ILA747F ILA747DM SG711CT ILA711HC SG7908K ILA7908KM

ILA747H ILA747HM SG723CJ ILA723DC SG7908CK ILA7908KC

ILA747CF ILA747DC SG723CT ILA723HC SG7908CP ILA7908UC

pA747CH pA747HC SG723J ILA723DM SG7912K ILA7912KM

ILA747CN pA747PC SG723T ILA723HM SG7912CK ILA7912KC

ILA748CN ILA748TC SG723CN ILA723PC SG7912CP ILA7912UC

'N ote

1-8

(16)

Industry Cross Reference Guide

SILICON TEXAS TEXAS

GENERAL (Cont.) INSTRUMENTS (Cont.) INSTRUMENTS (Cont.)

SG7915K ILA7915KM LM2903P ILA2903TC ULN2003AJ ILA9667DC

SG7915CK ILA7915KC MC1458JG ILA1458RC ULN2003AN ILA9667PC

SG7915CP ILA7915UC MC1458P ILA1458TC ULN2004AJ ILA9668DC

SG75450BCN ILA75450BPC MC1558JG ILA1558RM ULN2004AN ILA9668PC

SG75451BCM ILA75451BTC NE555P ILA555TC ILA709MU ILA709FM

SG75451BCY ILA75451BRC NE556N ILA556PC ILA709AMU ILA709AFM

SG75452BCM ILA75452BTC RC4136J ILA4136DC ILA709CP ILA709TC

SG75452BCY ILA75452BRC RC4136N ILA4136PC ILA710CJ ILA710DC

SG75453BCM ILA75453BTC SA555P ILA555TC ILA710CN ILA710PC

•

SG75453BCY ILA75453BRC SN55107AJ ILA55107ADM ILA710MJ ILA710DM

SG75461CM ILA75461TC SN55110AJ ILA55110ADM ILA711CN ILA711PC

SG75462CM ILA75462TC SN75107AJ ILA75107ADC ILA711MJ ILA711DM

SN75107AN ILA75107APC ILA723CJ ILA723DC

TEXAS SN75107BJ ILA75107BDC ILA723CN ILA723PC

INSTRUMENTS SN75107BN ILA75107BPC ILA723MJ ILA723DM

AM26S10CJ ILA9640DC SN75108BN ILA75108BPC ILA733CJ ILA733DC

AM26S10CN ILA9640PC SN75110AJ ILA75110ADC ILA733CN ILA733PC

LM101AJ ·ILA101AHM SN75110AN ILA75110APC ILA733MJ ILA733DM

LM105L ILA105HM SN75114J ILA9614DC ILA741CJG ILA741RC

LM111JG ILA 111RM SN75114N ILA9614PC ILA741CP ILA741TC

LM124J ILA124DM SN75115J ILA9615DC ILA741MJG ILA741RM

LM139J ILA139DM SN75115N ILA9615PC ILA747C ILA747DC

LM139AJ ILA139ADM SN75150N ILA75150PC ILA747CN ILA747PC

LM148J ILA148DM SN75150P ILA75150TC ILA747MJ ILA747DM

LM193JG ILA193RM SN75154J ILA75154DC ILA748CP ILA748TC

LM201AJG ·ILA201AHM SN75154N ILA75154PC ILA2240CJ ILA2240DC

LM209LA ·ILA209KM SN75188J ILA1488DC ILA2240CN ILA2240PC

LM217KC ILA217UV SN75188N ILA1488PC ILA7805CKC ILA7805UC

LM224J ILA224DV SN75189J ILA1489DC ILA7808CKC ILA7808UC

LM224N ILA224PV SN75189N ILA1489PC ILA7812CKC ILA7812UC

LM239J ILA239DC SN75189AJ ILA1489ADC ILA7815CKC ILA7815UC

LM239N ILA239PC SN75189AN ILA1489APC ILA7818CKC ILA7818UC

LM248J ILA248DC SN75450BN ILA75450BPC ILA7824CKC ILA7824UC

LM293JG ILA293RC SN75451BJG ILA75451BRC ILA7885CKC ILA7885UC

LM293P ILA293TC SN75451BP ILA75451BTC ILA78L05CLP ILA78L05AWC

LM301AP ILA301ATC SN75452BJG ILA75452BRC ILA78L12CLP ILA78L 12AWC

LM305L ILA305HC SN75452BP ILA75452BTC ILA78L15CLP ILA78L 15AWC

LM305AL ILA305AHC SN75453BJG ILA75453BRC ILA78M05CKC ILA78M05UC

LM309LA ·ILA309KC SN75453BP ILA75453BTC ILA78M06CKC ILA78M06UC

LM311JG ILA311RC SN75461P ILA75461TC ILA78M08CKC ILA78M08UC

LM311P

-

^ILA311TC ^SN75462P ILA75462TC ILA78M12CKC ILA78M12UC

LM317KC ILA317UC SN75471P ILA75471TC ILA78M15CKC ILA78M15UC

LM318JG ·ILA318HC SN75472P ILA75472TC ILA78M24CKC ILA78M24UC

LM324J ILA324DC SN75491N ILA75491PC ILA7905CKC ILA7905UC

LM324N ILA324PC SN75492N ILA75492PC ILA7908CKC ILA7908UC

LM339AJ ILA339ADC TL081ACJG ILA771 ARC ILA7912CKC ILA7912UC

LM339AN ILA339APC TL081ACP ILA771ATC ILA7915CKC ILA7915UC

LM339J ILA339DC TL081BCJG ILA771BRC ILA79M05CKC ILA 79M05AUC

LM339N ILA339PC TL081BCP ILA771BTC ILA79M08CKC ILA 79M08AUC

LM348J ILA348DC TL081CJG ILA771RC ILA79M12CKC ILA 79M 12AUC

LM348N ILA348PC TL081CP ILA771TC ILA79M 15CKC ILA 79M 15AUC

LM376P ILA376TC TL431CLP ILA431AWC 9614CJ ILA9614DC

LM393JG ILA393RC TL494CN ILA494PC 9614CN ILA9614PC

LM393P ILA393TC TL494CJ ILA494DC 9615CJ ILA9615DC

LM2901J ILA2901DC TL494MJ ILA494DM 9615CN ILA9615PC

LM2901N ILA2091PC ULN2001AN ILA9665PC

LM2902N ILA2902PV ULN2002AJ ILA9666DC

LM2903JG ILA2903RC ULN2002AN ILA9666PC

'Note

1·9

(17)

FAIRCHILD

Three basic units of information are contained in the ordering code.

fLA741 T C

Device Type Package Type Temperature Range

Device Type

This group of alpha numeric characters defines the device including functional and electrical characteristics, alpha suffixes are added to further delineate electrical options.

Package Type

One alpha suffix represents the basic package style.

D Dual In-line (Hermetic, Ceramic) F Flatpak (Hermetic)

H Metal Package

J Dual In-Line (Side Brazed) K Metal Power Package (TO-3) P Dual In-Line (Molded)

R 8-lead DIP (Hermetic, Ceramic) S Metal Package (Hybrid only) T 8-lead DIP (Molded)

U Power Package (Molded, TO-220) U1 = Power Package (Molded) W = Molded Package (TO-92 Outline) Different outlines exist within each package style to accommodate various die sizes and number of leads.

Specific dimensions for each package can be found in the Package Outline section of this catalog, listed by online code. These specific codes are referenced on each data sheet.

Temperature Range

One alpha suffix represents one of the following three basic temperature grades in common use. Exact values and conditions are specified on the device data sheets.

c

~ Commercial M Military v ~ Industflal O°C to + 70/75°C - 55°C to + 125°C - 20°C to 85°C

-55°Cto + 85°C -40°Cto +85°C

Examples

fLA741 FM This number code indicates a fLA741 Operational Amplifier in a flatpak with military temperature rating capability.

fLA725EHC This number code indicates a fLA725 Instrumentation Operational Amplifier, electrical option E, in a metal package with a commercial temperature rating capability.

1-10

Ordering Information

Device Identification

All Fairchild standard catalog linear circuits will be marked as shown in the following example.

fLA710DC F Date Code

(18)

FAIRCHILD

(19)

2-2

(20)

FAIRCHILD

Testing Voltage Regulators

All Fairchild voltage regulators are factory-tested with automated equipment to ascertain that they meet or exceed guaranteed specifications. The testing equipment operates at relatively high speeds and automatically measures output voltage tolerances, line and load regulation, quiescent current, short- circuit current, and a long list of other voltage regulator parameters. To adequately interpret published voltage regulator specifications, it is advisable to have some understanding of the testing as performed at Fairchild. This is also important for customer incoming inspection, as some correlation is necessary between factory testing and customer acceptance testing.

Individual parameter tests performed on Fairchild voltage regulators require only a few milliseconds, so a complete regulator test can be accomplished in a fraction of a second. Such short testing times mean that the device junction temperature is very close to ambient. If the devices were tested under steady- state conditions, costs would unfortunately increase, and the increased expense would be passed on to the customer. Consequently, published parameters are based on fast testing and usually specified with a constant junction temperature of 25°C. Exceptions are noted in the individual data sheet tables.

When a regulator is operated with high dissipation, however, the effect of temperature drift must be evaluated or at least considered. For example, a /tA7805 1 ampere positive voltage regulator with a junction temperature of 25°C, a 10 V input, and a load current variation of 1.5 A has a guaranteed load regulation of less than 50 mV for military-grade units and less than 100 mV for commercial-grade units.

Under steady-state testing conditions, as opposed to pulsed testing conditions, junction temperature would increase by 30°C to 55°C (based on a 4°C/W junction-to-case thermal resistance and an infinite heat sink.) The /tA7805 regulator has a temperature coefficient of -1.1 mV / °C, so a 30°C junction-temperature increase means an output voltage drift of -33 mY. This drift must be

considered if load regulation is being measured under steady-state conditions.

Incoming inspection tests should accommodate these conditions. One approach would be to duplicate the testing procedure used by manufacturing; i.e., maintain a constant junction temperature of 25°C. If steady-state testing is performed during acceptance evaluation, a correlation between the method used in incoming inspection and the method used by

2-3

Voltage Regulator Testing

Linear Products

Fairchild must be established. In this case, the temperature coefficients of each regulator type must be considered.

3-Termlnal Regulators

Testing of 3-terminal regulators is performed at input voltages that reflect actual use conditions. The input-output voltage differential considers all of the variations associated with nominal, unregulated power supplies. For example, a 12 V regulator (/tA7812) test uses a 7 V I/O voltage differential and considers the following parameters.

Device Input/Output Voltage Differential-2 V Nom.

Line Voltage Reference-10%

Filtered Supply Ripple-100f0 Line Regulation-1 0%

Diode Drop and Source Impedance Variations-1 V

This is expressed in the following equation.

VIN

=

VOUT(max) + (VIN - VOUT) + Ripple + Line Reg + Vo

=

12.6V+2V+ 1.46V+ 1.6V+ 1 V

=

^{18.66 V}

A 12 V regulator, then, is not only tested with a guard band, but the input voltage range used allows for greater variation than is present in actual operating conditions. All Fairchild 3-terminal regulator tests are based on similar practical considerations.

Figure 2-1 shows a self-contained load-pulsing circuit that can be used for measuring load regulation of either a positive or negative regulator. The /tA555 timer operates in the astable mode as a free-running multivibrator. Transistors 02 and 04, along with the load resistors RL, provide the required loading across the regulator outputs. The on and off times of 02 and 04 are set by potentiometers R2 and R4. Transistors 02 and 04 must be capable of handling the load current levels to be measured. Line regulation of positive or negative regulators can be measured using the circuits in Figure 2-2. Here a pulse generator switches the input voltages between VIN (min) and VIN (max) but a similar arrangement could be used by substituting a /tA555 timer for the pulse generator.

(21)

Fig.2-1 Self-Contained Load Regulation Test Circuit for Positive or Negative Regulators

7T035V +S.

ON ~A78M05 OUT COM

+ C1 C3 C'

IOOpF 03,1.1F 01.uF

C' + CO + _C'

SOD /.IF

.. ^-

^1._

COM ON p.A78M05 OUT

-7 TO-35Y -5.

Fig. 2-2 Line Regulation Test Circuits a. For Positive Regulators

VON (MAX) - - - -... -....,

390 {l

••

^{posmVE ON}

260 k NEGATIVE OFF

.,

1k

'.3·~

~k

...

SCOPE TRIGGERING

.,

24n

POSITIVE INPUT

o o

r---J----,

o

I IN I

-~ - -r -~

OUT

R:g~~~i~A

:

AL+ I I I

I I COM I

I L.. ___ -, ____ J ..l. VOUl (+1 I

MONITOR I

---.,

o _o .l. VOUT (-) I

MONITOR I

Q4 I r---.J----,

I I COM I

o 0 0

-

~

-. -1

^OUTR:~~~!~~R ^:

I IN I

L ___ , ____ .J o o o NEQATIVE

INPUT

VON ( M I N ) - - - I ) I - - - - + -... p---t IN R:g~~~~~R OUT 1--.... - -.... - + Vour

0.J'l.

TO PULSE

GENERATOR

b. For Negative Regulators

0"'1.1"

TO PULSE

GENERATOR

50 {l 100 {l

270 pF

COM

RL

+ 1 ~F RL

390 II

.... -t)t---VON (MIN)

L . . . - -... - - - - V O N (MAX)

2·4

(22)

Ripple Rejection

Ripple rejection is the ratio (in dB) of the regulator input ac component (or the output of the sine wave generator) to the output ac component of the device under test. Its measurement is quite straightforward.

Ripple rejection of Fairchild regulators is normally specified at a load current of 30 to 50% of the rated output of the device. This is more realistic than the 20 mA or so specified by some other manufacturers.

A regulator with good ripple rejection at low output currents maY.not necessarily maintain this feature at moderate-to-high current levels unless special effort is made during the layout of the integrated circuit to keep the reference circuit on isotherms (equal temperature lines) and away from the heat source (series-pass element).

Figure 2-3 shows two simple circuits for measuring ripple rejection of positive and negative regulators.

Fig. 2-3 Ripple Rejection Measurement Circuits a. For Positive Regulators

+

5k 2N6123

The 5 k potentiometers in both circuits provide the bias necessary to produce the dc level of the input voltage to the regulator. The sine-wave generators are used to produce the ac component of the regulator input voltage.

Life Test and Burn-In (See Figure 2-4)

Burn-in information is provided here as a guide to perform regulator life testing. The burn-in performed by Fairchild is based on the thermal resistance of the regulator package. The power dissipation level is selected so that the junction temperature is near the maximum specified level (150°C for most products).

The power level is then determined based on the chosen ambient. In general, burn-in is performed at 25°C ambient without a heat sink but it can also be done with a heat sink or a different ambient.

SINE WAVE

GENERATOR +---p__--1IN R;2~~~~~R OUT 1---1p---1~-VOUT

1 k COM

b. For Negative Regulators +

Fig.2-4 Burn-In Circuit for ILA7805 Regulator In TO-220 Package

IN 7805 OUT

.33 ~F COM

;

1

2-5

0.1 ~F RL 30 II

RL+

(23)

Example: Determine a burn-in circuit, operating at a 25°C ambient, for a ILA7805 in the TO-220 package.

From the data sheet:

OJA = 65°C/W max TJ (max) - TA

Po

=

-"---;;-OJ-A--'- 1506~ 25 = 1.92 W If RL = 30 fl and the effects of 10 are neglected,

VOUT

or

Po

=

(VIN - VOUT)

RL

VIN = Po RL

- V -

+

^VOUT

=

16.5 V OUT

If the same circuit is used at an ambient of 125⁰C, RL

+

V

VIN = Po VOUT OUT 150-125 30

+

5

65 X 5

= 7.3 V

2·6

Note that the value of the load resistor chosen here (30 fl) is arbitrary. Any other value giving output currents within the rating of the device could be used.

If the burn-in is to be performed at more than one temperature, selecting a common load resistor for all temperatures and changing the input voltage to give the required power dissipations simplifies the design and construction of the burn-in fixtures.

(24)

FAIRCHILD

To fully utilize the various available regulator packages, sufficient attention must be paid to proper heat removal. For efficient thermal management, the user must rely on important parameters supplied by the manufacturer, such as junction-to-case and junction-to-ambient thermal resistance and maximum operating junction temperature. The device

temperature depends on the power dissipation level, the means for removing the heat generated by this power dissipation and the temperature of the body (heat sink) to which this heat is removed.

Figure 6- t shows a simplified equivalent circuit for a typical semiconductor device in equilibrium. The power diSSipation, which is analogous to current flow in electrical terms, is caused by a heat source similar to a voltage source. Temperature is analogous to voltage potential and thermal resistance to ohmic resistance. Extending the analogy of Ohm's law to

TJ - TA OJA(tot)

=

^0JC

+

OCS

+

USA

=

^Po

Thermal resistance, then, is the rise in the

temperature of a package above some reference level per unit of power dissipation in that package, usually expressed in degrees centigrade per watt. The reference temperature may be ambient or it may be the temperature of a heat sink to which the package is connected. There are several factors that affect thermal resistance including die size, the size of the heat source on the die (series-pass transistor in an

Ie

regulator), die-attach material and thickness, leadframe material, construction and thickness.

Fig. 6·1. Simplified Thermal Circuit

.--_ _ _ _ ,,-.. _ _ _ ... TJ JUNCTION TEMPERATURE POWER (P)

HEAT SOURCE

8JC JUNCTION-TO-CASE THERMAL RESISTANCE Tc CASE TEMPERATURE 8CS CASE·TO-SINK

THERMAL RESISTANCE TS SINK TEMPERATURE 8SA SINK-TO-AMBIENT

THERMAL RESISTANCE '--_ _ _ _ _ _ _ _ . . TA AMBIENT TEMPERATURE

2·7

Thermal Considerations

Thermal Evaluation Of Regulators

To measure thermal resistance, the difference between the junction temperature and the chosen reference temperature, case, sink or ambient, must be determined. Ambient or sink temperature

measurement is straightforward. For case- • temperature measurement, the device should have a sufficiently large heat sink and the power level should be close to the specified rating of the package-die combination. The case or tab temperature can be measured by an infrared microradiometer or by using a thermocouple soldered to a point in the center of the case or tab at the tab-heat-sink interface as close to the die as practical.

Measurement of the junction temperature, unfortunately, is not as simple and involves some calibrations. There are several methods available for junction-temperature measurement; the two most commonly used are described here.

Thermal Shutdown Method

With this method, the thermal shutdown temperature of each device is used as the thermometer in

determining the thermal resistance. The device is first heated externally, with as little internal power dissipation as practical, until it reaches thermal shutdown. Then, with the device mounted on a heat sink, the regulator is powered externally until it reaches thermal shutdown again. With some

packages, the ambient of the device and its heat sink may have to be elevated sufficiently to force the regulator into shutdown. The thermal resistance of the device can then be calculated by using

TJ - TC Po

where 0JC is the junction-to-case thermal resistance T J is the measured thermal shutdown

temperature

T C is the measured case temperature Po is the power dissipated to force the device

into shutdown and is equal to (V IN - VOUT) lOUT

+

VIN 10

10 is the quiescent current of the device and can be neglected for low thermal resistance packages such as the TO-3 and TO-220.

(25)

Substrate or Isolation Diode Method The second method of thermal-resistance

measurement utilizes the isolation diodes within the integrated circuits as temperature sensing element' . Under normal operating conditions. the substrate diodes are reverse biased and separate or "isolate"

active as well as passive components within an integrated circuit. (See Figure 6-2). When the regulator is reverse biased and a constant current is forced through the device between the input terminal and ground. the substrate diodes become forward biased; naturally. when the forward drop is measured.

the diode with the highest temperature (lowest forward drop) is detected. Measurement of the thermal resistance of the regulator then involves two steps:

Calibrating the substrate diode at a fixed ISUBS level in an oven or bath at two temperatures.

preferably near the device operating junction temperature. It is assumed that this voltage drop changes linearly with temperature.

'For more detailed explanation of this method, see Fairchild Application Note 205, "Thermal Evaluation of Integrated Circuits". For p,A723 thermal considerations, see page 3·29.

Fig, 6-2 Monolithic Transistor Isolation

Cross-sectional Diagram Showing Two Monolithic Transistors Isolated by Substrate Diodes

Measuring the junction temperature. The device is powered through a switching circuit S 1 at a duty cycle greater than 99% (Figure 6-3); thus the device is electrically heated until it reaches equilibrium.

During short measuring intervals

«

1 % duty cycle).

the switching circuit de-energizes the device and the forward drop of the substrate diode is measured at the previously calibrated ISUBS current level. This voltage drop must be measured as soon as possible (several microseconds) after the removal of the power pulse to avoid inaccurate readings due to cooling of the chip. Diode 01 prevents reverse current from flowing through the load resistor RL during the substrate-diode measuring interval. Since the change in the isolation diode drop is assumed to be linear with temperature. the measured voltage drop can be converted to its corresponding junction temperature by interpolation or extrapolation.

Thermal resistance can then be calculated by the same formula used in the thermal-shutdown method.

Heat Sink Requirements

When is a heat sink necessary. and what type of a heat sink should one use? The answers to these questions depend on reliability and cost requirements.

Heat sinking is necessary to keep the operating junction temperature T J of the regulator below the

COLLECTOR SUBSTRATE DIODES COLLECTOR

+ +

SUBSTRATE

EMIITER EM lITER

Equivalent Circuit

Fig, 6-3 Thermal ReSistance Measurement Circuit Using Substrate Diode Technique

VOUT

+

^ISUBS

DUT OUTPUT 1--+--0

COMMON D1

2-8

(26)

specified maximum value. Since semiconductor reliability improves as operating junction temperature is lowered, a reliability I cost compromise is usually made in the device design.

Table 6-1 is a tabulation by package of the various regulators available from Fairchild. It also lists the average and maximum values of thermal resistance for the regulator chip-package combinations and can be used as a guide in selecting a suitable package when designing a regulator circuit.

Thermal characteristics of voltage-regulator chips and packages determine that some form of heat sinking is mandatory whenever the power dissipation exceeds the following.

0.67 W for the TO-39 package 0.69 W for the TO-92 package

1.56 W for the Mini Batwing and Power Watt (similar to TO-202) packages

1.8 W for the TO-220 package 2.8 W for the TO-3 package

at 25°C ambient or lower power levels at ambients above 25°C.

To choose or design a heat sink, the designer must determine the following regulator parameters.

PO(msx)-Maximum power dissipation: (V IN - VOUT) lOUT

+

VIN 10

T A(max)-Maximum ambient temperature the regulator will encounter during operation.

Fig. 6-4 Heat Sink Material Selection Guide

T J(max)-Maximum operating junction temperature, specified by the manufacturer.

OJC, OJA-Junction-to-case and junction-to-ambient thermal resistance values, also specified by the regulator manufacturer.

Ocs-Case-to-heat-sink thermal resistance which, for large packages, can range from about 0.2°C/W to about 1 °C/W depending on the quality of the contact between the package and the heat sink.

0SA-Heat-sink-to-ambient thermal resistance, specified by heat-sink manufacturer.

Maximum permissible dissipation without a heat sink is determined by

T J(max) - T A(max) Po (max) = OJA

If the device dissipation Po exceeds this figure, a heat sink is necessary. The total required thermal

resistance may then be calculated.

T J(max) - T A(max) OJA(tot)

=

^OJC

+

OCS

+

OSA

=

^Po

Case-to-sink and sink-to-ambient thermal resistance information on commercially available heat sinks is normally provided by the heat sink manufacturer. A summary of some commercially available heat sinks is shown in Table 6-2. However, if a chassis or other conventional surface is used as a heat sink, Figure 6-4 can be used as a guide to estimate the required surface area.

SURFACE AREA (SOTH SIDES OF THE HEAT SINK)

SQUARE INCHES

1IIIIIIIIIIiiliilIIIIII 111I1I11I1I11I1I1iiI~ 1111111111"11111111111111111111111111111111111111111111111111111 3 4 5 6 8 10 15 20 2530 40 5060 80 3/16"' 11111111111111111111111111111111111111111111111111111111111111111 I I ! III THICKNESS : 7 7 6 65 5 44 3 3 2 251 5 2 1

3/32" 1IIIIIlillhliillllllllllllllllllllllllllllllllllili I 11111111 3/16" 11111111"111"111111"1111111111"1"111111111111111111111 I

THICKNESS 7 6 5 4 3 215 1

7 6 5 4 3 25 2

3/32" 11111111111111111111111111111111111 11111111 II I I I I I I 3/16" 111111111111111111111111111111111111111111 II 1111111

7 6 5 4 3 25 2

8 7 6 5 4 35 3 2 5 2

THICKNESS

3/32" 1IIIljllllllllllWllllllllillillllllliJillllllllllllililliti 3/16" 1"11111111"111"111""1""1"1111111 II I I I I II III THICKNESS / 66 5 5 4 4 ; 5 32 6 2 5 2 2

3/32" 111111111

Ii

1111111 111111111111111 II II I I I II I " 111111 THERMAL RESISTANCE IN °C/W

To determine either area reqUired or thermal resistance of a given area, draw a vertical line between the top (or area) hne down to the mateflal 01 interest.

2-9

COPPER.

HORIZONTALLY- MOUNTED

COPPER.

VERTICALLY- MOUNTED

ALUMINUM.

HORIZONTALLY- MOUNTED

ALUMINUM.

VERTICALLY - MOUNTED

(27)

Table 6-1 Thermal Resistance (liJC, liJA) By Device and Package'

Resistances Listed as Follows:

liJC (TVP) liJC (MAX) In 0C/W liJA (TVP) liJA (MAX)

Device Reg,Type No.!Series

~A78LXX

~A78MXX

~A 109, ~A209

~A309, 5 V

Pos, _~A78XX

3-Term

78H05, 5 V

~A78HXX

Neg. ^~A79MXX

3-Term

~A79XX

~A1051

305/376

~A723

Pos. ~A78MG

Adj. 4-TERM

~A78G 4-TERM

~A78HG

~A79MG

Neg. 4-TERM.

Adj. _~A79G

4-TERM.

Note

'Similar to TO-202

4-Lead

lOUT TO-3 TO-3

(A) K K

0.1 0.5

1 3.5 5.5 40 45 1 3.5 5.5 40 45

5 1.52.0

37 40 5 2.0 2.5 32 38 0.5

3.5 5.5

1 40 45

0.012 to 0.045 0.125 0.5

1 4.0 6.0

4447

5 2.0 2.5

32 38 0.5

4.0 6.0

1 44 47

2-10

Power

TO-220 Watt TO-39

U U1' H

20 40 140 190

3.05.0 18 25

62 70 120 185

3.0 5.0 60 65

3.0 5.0 18 25

62 70 120 185

3.0 5.0 60 65

6 8 7580 6 8 7580

(28)

4-Lead TO-99 TO-100 TO-116 TO-116 8 Pin TO-39 TO-92 8-Lead TO-S 10-Lead TO-S 14-Pin Plastic 14-Pin Ceramic Minidip

H W H H 0 0 T

- -

160 180

•

25 40

- -

150 190 160 190

25 50

- - - -

150 190 150 190 125 160

18 25 125 185

2-11

(29)

How to Choose a Heat Sink-Example

Determine the heat sink required for a regulator which has the following system requirements:

Operating ambient temperature range: 0°C-60°C Maximum junction temperature: 125°C

Maximum output current: BOO mA Maximum input to output differential: 10 V

From Table 6-1, the choice is narrowed down to the /LA7BOO family, available in TO-3 and TO-220 packages. The TO-220 package is sufficent (lower cost, better thermal resistance).

OJe

=

5°C/W maximum (from data sheet or Table 6-1)

BJA(tot) = OJC

+

OCS

+

^BSA= 125 - 60

Bes

+

OSA = O.B X 10 - 5 = 3.13°C/W Assuming Bes = 0.13°C/W then BSA = 3°C/W This thermal resistance value can be achieved by using either 22 square inches of 3/16 inch thick vertically mounted aluminum (Figure 6-4) or a commercial heat sink (Table 6-2).

Tips for Better Regulator Heat Sinking

Avoid placing heat-dissipating components such as power resistors next to regulators.

When using low dissipation packages such as TO-5, TO-39, and TO-92, keep lead lengths to a minimum and use the largest possible area of the printed board traces or mounting hardware to provide a heat dissipation path for the regulator.

Table 6-2. Heat Sink Selection Guide

When using larger packages, be sure the heat sink surface is flat and free from ridges or high spots.

Check the regulator package for burrs or peened-over corners. Regardless of the smoothness and flatness of the package and heat-sink contact, air pockets between them are unavoidable unless a lubricant is used. Therefore, for good thermal conduction, use a thin layer of thermal lubricant such as Dow Corning DC-340, General Electric 662 or Thermacote by Thermalloy.

In some applications, especially with negative regulators, it is desirable to electrically insulate the regulator case from the heat sink. Hardware kits for this purpose are commercially available for such packages as the TO-3 and TO-220. They generally consist of a 0.003 to 0.005 inch thick piece of mica or bonded fiberglass to electrically isolate the two surfaces, yet provide a thermal path between them.

As expected, the thermal resistance will increase but, as in the direct metal-to-metal joint, some

improvement can be realized by using thermal lubricant on each side of the mica.

If the regulator is mounted on a heat sink with fins, the most efficient heat transfer takes place when the fin is in a vertical plane, as this type of mounting forces the heat transfer from fin to air in a combination of radiation and convection.

If it is necessary to bend any of the regulator leads, handle them carefully to avoid straining the package.

Furthermore, lead bending should be restricted since repeated bending will fatigue and eventually break the leads.

This list is only representative. No attempt has been made to provide a complete list of all heat sink manufacturers.

All values are typical as given by manufacturer or as determined from characteristic curves supplied by manufacturer.

BSA Approx.

(OC/W) TO-3 Packages 0.4 (9" length) 0.4-0.5 (6"

length) 0.56-3.0 0.6 (7.5" length) 0.7-1.2 (5-5.5"

length) 1.0-5.4 (3"

length)

Manufacturer and Type Thermalloy (Extruded) 6590

Series

Thermalloy (Extruded) 6660, 6560 Series

Wakefield 400 Series Thermalloy (Extruded) 6470

Series

Thermalloy (Extruded) 6423, 6443, 6441, 6450 Series Thermalloy (Extruded) 6427,

6500,6123,6401,6403,6421, 6463,6176,6129,6141,6169, 6135, 6442 Series

2-12

0SA Approx.

(OC/W) 1.9 2.1 2.3-4.7 4.2 4.5 4.B-7.5 5-6 5-10 5.6 5.9-10 6 6.4 6.5-7.5 B

Manufacturer and Type IERC E2 Series (Extruded) IERC E 1, E3 Series (Extruded) Wakefield 600 Series IERC HP3 Series Staver V3-5·2

Thermalloy 6001 Series IERC HP3 Series Thermalloy 6013 Series Staver V3-3-2

Wakefield 6BO Series Wakefield 390 Series Staver V3-7-224 IERC UP Series Staver Vl-5

1982 LINEAR DIVISION PRODUCTS